Python 如何使用Django queryset混合求和和和算术
我的代码中有这样的代码:Python 如何使用Django queryset混合求和和和算术,python,django,Python,Django,我的代码中有这样的代码: forcasting_order = ProductLine.objects.values('product_name', 'product_id')\ .filter(delivery_date__date__in=ref_days, order_date__date=Fu
forcasting_order = ProductLine.objects.values('product_name', 'product_id')\
.filter(delivery_date__date__in=ref_days, order_date__date=Func(F('delivery_date'),function="date"))\
.annotate(quantity_to_order=Sum('quantity'))\
.order_by('product_id')
for x in forcasting_order:
x['quantity_to_order'] = round(x['quantity_to_order'] / Command.avg_on_x_week)
在查询中有没有办法将总和(“数量”)除以一个常量整数(这里是Command.avg_on_x_week?试试这样的方法:
from django.db.models import Value
.annotate(quantity_to_order=Sum('quantity') / Value(Command.avg_on_x_week))